20.0.0

Major Changes

• frequencies: Changes the logic for calculating the time points when frequencies are estimated to ensure that the user-provided "end date" is always included. This change in the behavior of the frequencies command fixes a bug where large intervals between time points (e.g., 3 months) could cause recent data to be omitted from frequency calculations. See the pull request for more details included the scientific implications of this bug. #1121 (@huddlej)